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FD124L gear flow dividers

shane gillies Nov 30, 2012 04:55PM EST

If i have a FD124L flow divider with 3 by 1" segments and 1 by 2" segment and external relief valves down stream of the unit set at 2800 psi for 2 of the 1" segments and 2000 psi for the rest will the flow divider deal with the preasure diferential in the unit if one or more of the other segments are turned of and returned straight to filter systerm during the operatin of machine. Total flow to unit would be 35 gpm and full preasure may or may not be used in any circuit. the preasures are max relief valve settings but circuits will reach these during start up ( exhaust Fans)

1 Community Answers

Best Answer
Andrew Rieser Dec 05, 2012 03:31PM EST

With flow dividers the system requires relief valves as you have.

The unloaded sections essentially turn into motors with a positive pressure on the inlet that is common to all sections and zero on the outlet allowing torque from this section to increase pressure in the other sections. Remember in flow dividers the input horsepower is close to the outlet horsepower.

Simple example: Numbers shown to be theoretical.

Two section flow divider with 20 GPM in split 10 GPM each section.

Section 1 is unloaded to tank

Section 2 requires 2000 PSI to lift cylinder


The input will be 20 GPM in at 1000 PSI

Section 1 has 1000 PSI in and 0 out developing torque to help section 2 start at 1000 PSI in and 2000 PSI out


Input HP 20 GPM*1000 PSI/1714=11.66 HP

Output HP (10 GPM*2000 PSI + 10 GPM*0 PSI)/1714=11.66 HP


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